System Performance

ASUS has employed the Intel Core M processor in the design of the UX305, and unlike the first device we tested with Core M, ASUS has created the UX305 as a fanless design. This is likely easier to achieve when you consider that the UX305 is completely constructed out of aluminum. Aluminum is a great conductor of heat, and allows a big part of the laptop to be a cooling surface. The heat is also kept at the top of the keyboard deck, where it is less likely to be noticed when using the laptop. During most general use of the UX305, it does not get warm anyway, and only when used for extended periods of high use did I notice it get hot.

The UX305 will be offered with either the Core M-5Y10 or 5Y71 processors, although for North America the 5Y10 is the only available processor right now. It is a dual-core, quad-thread CPU with an 800 MHz base frequency, and 2 GHz boost frequency. This is a big step down from the 5Y71 which has a 1.2 GHz base and 2.9 GHz boost capability, so it will be interesting to see how the UX305 performs. I have highlighted the Lenovo Yoga 3 Pro since it is the only other Core M device we have tested, and it has the Core M-5Y71 processor onboard.

To compare the performance, I have selected a sampling of devices that we have tested which are roughly the same class of device. To compare the UX305 to any other device we have tested, please use our Notebook Bench.

PCMark

PCMark 8 performs four sets of tests, with different use case scenarios to get a feel for how the device will perform on several different sets of tasks. The UX305 performs quite well here, despite the Core M processor. You can see that it even outperforms the Yoga 3 Pro on several of the tests, and it has a faster version of the Core M CPU. We will dig into that more in a bit.

Cinebench and x264

On the single-threaded runs of Cinebench, The UX305 is near the bottom of the pack. That is unsurprising, since it has a boost clock of just 2 GHz, and furthermore on a single-threaded runs most CPUs can usually perform very close to their boost clock for the duration. Consequently the extra 900 MHz on the Yoga 3 Pro's 5Y71 pulls a big lead here. It is interesting to note that the only Haswell-Y based processor that was in Bench was the Core i3 version of the Surface Pro 3. Broadwell-Y (Core M) handily outperforms it in both single and multi-threaded workloads. This has a lot to do with the Core i3 having no boost clocks at all.

Moving on to the Multi-threaded workloads, we can see that the UX305 is still near the bottom of the chart, but it has passed the Yoga 3 Pro with 5Y71. The same thing occurs on the x264 benchmark, which lasts several hours. We need to see a couple of more benchmarks to get an idea of what is going on.

TouchXPRT 2014

TouchXPRT is a Windows Store benchmark which performs several common tasks that someone at home may perform. All of the benchmarks result in a time to complete a task, which is then converted into an overall score. Here the UX305 plummets to the bottom of the charts, owing once again to its relatively low boost clock, scoring the lowest overall score of any device we have tested. The Yoga 3 Pro on the other hand with Core M 5Y71 and a 2.9 GHz boost clock has the highest overall score of any of the Ultrabooks in the chart. Once again we see a very different result from the previous test.

Web Benchmarks

Running Javascript based browser benchmarks, the UX305 with Core M 5Y10 once again falls to the bottom of the chart. With just a 2 GHz boost clock, the 5Y10 struggles to compete against the likes of other laptops with faster Core M or U series processors. The ASUS UX305 cannot be converted into a tablet, but I have included some tablet benchmarks here just to show how Core M-5Y10 compares against the best performing tablets. With around the same power envelope, even the slowest Core M is still significantly faster than any tablet in CPU performance.

Explaining Core M Performance

On system performance, we have seen some fairly wild swings when comparing the UX305 with the slowest Core M processor available to other devices, especially the Yoga 3 Pro which has the fastest Core M released so far with the 5Y71. The Yoga 3 Pro even includes a fan, whereas the UX305 is passively cooled. On quick, burst benchmarks such as TouchXPRT, and on single-threaded benchmarks such as Cinebench, and even on the web tests the Yoga 3 Pro with 5Y71 offers a lot more performance. However on the longer benchmarks the UX305 pulls ahead despite the lower base and boost clock speeds.

Traditionally, it was just a given that higher numbered processors of the same processor family would give you better performance, but with the kind of devices Core M is being integrated into, that is not the case at all. There are a lot more factors at play when you look at Core M as a whole in order to understand where the performance level is going to be. For example, ASUS has opted to allow the processor to get much hotter, which then translates to higher surface temperatures on the device, especially since it is passively cooled. But this lets Core M keep its clock speeds higher when performing extended workloads. Lenovo on the other hand, even with a fan, has opted to keep the CPU temperature much lower, but that forces the CPU to throttle down under extended workloads. On a long test, the ASUS CPU hit as high as 80°C, but the Lenovo kept the CPU to around 60°C, and due to the fan, the surface temps of the laptop did not get warm very much at all.

The performance of Core M is much more akin to how a smartphone or tablet is limited in performance, where the manufacturer has to look at overall device temperatures and decide where they want to limit performance. ASUS has chosen a much more aggressive temperature, and it does not affect the device use very much because it is a laptop, and therefore can be used on a desk. You do not have to hold the device, so even though it can get to over 47°C (117°F) between the display and the top of the keyboard, the palm rests and keyboard never get warm at all. The aluminum chassis comes into play and can act as a large heat sink. Lenovo has chosen a much lower device temperature, but the Yoga 3 Pro is a convertible and can be used as a tablet, so having such a high surface temperature would be a big issue. Of course, if you are using the UX305 in your lap, it would be very uncomfortable as well, so watch out for that. For general tasks, the device does not get warm, but if you are doing extended heavy workloads, it can be an issue.

One such task which causes heavy use for extended times is gaming, so next up is GPU performance.

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164 Comments

I was curious where Core M stood against some mid range 4-5 year old systems, namely Core 2 Duo. I checked on the Notebookcheck mobile CPU and GPU benchmarks, and it doesn't seem appreciably faster than the P8600/320M combo in an old white unibody macbook we have, for instance. The CPU scores a bit higher, not earth shattering, the GPU looks to track around the same. Is that wrong? Reply

Not to say that that's not impressive, going from that in 35+23 watts to a total of 5 watts, but it's not a huge upgrade for people on those systems either, apart from form factor and screen etc. Reply

That's great and all, except....who asked for a 5W notebook chip? Intel has been doing this for a while, moving the MAINSTREAM of the notebook market from M/H-series chips to U (CULV) series chips...and now to the even less powerful Y-series, which until Broadwell was so crap nobody dared to put it in their laptops (IVB-Y and Haswell-Y). Core M is just a slight upgrade over those.

It's already happening. We're already seeing "ultrabooks" such as this Asus, and the new Macbook Air arriving with these crappy chips, and making us pay $1300 for the privilege. Why the hell wouldn't I just use an ARM chip at this point in a $500 Chromebook, and with the same quality screen and materials?Reply

True. Chromebooks seem silly, and an answer to nothing right now, in today's state of technology. I think Krysto, you're missing a few things...just as comparing this to a 2010 Air or an '08 MacBook. It's got 8GB of RAM. The earlier MacBooks were 2, an option of four but no more. They were either using 5400 RPM HDDs or the earliest, slowest SSD technology, they didn't aport IPS panels (nor options like HiDPI <&1000!!). You were lucky to get two, two and a half hours on the old, white plastic MacBooks, maybe an hour more on the '10 Air....they were thicker, heavier, and not anywhere close to today's GPU solutions integrated, sharing some of that RAM, in some cases 2GB of its internal/existing system memory when necessary. Along with the improvements made to OS X, this is a machine built for 'Most'......Not you and I. Different needs, all that but plenty are getting by everyday without turning a laptop or their desktops at home on. iPads, your Nexus or Samsung tablet of choice -- even today's smartphones smoke those older MacBooks for all reasons mentioned above; portability, longevity, 'speed' (with PCIe storage now, quick NAND solutions in tabs), and overall function.There's a WHOLE lot of folks using their iPad for their email, facebook, casual gaming and web surfing, entertainment and media, constant, 'everywhere' connectivity radios and phenomenal displays you can throw in a bag and forget it's there. Even charge it with a cigarette lighter. Same applies to today's phablet phones ...as we've seen tab sales drop whether it's due to over saturation of the tablets in those who already 'want them', a slower upgrade cycle and/or the 'phablet' craze with incredible, HiDPI 5-6" display phones in our pockets...with the SAME power as their tablet counterparts (some compared favorably in this review ...IOW, iPhone 66/6+, Note 4 and incoming S6, new LGs, HTCs and iPhones, these 'phones' are going to be competing even more favorably this year to these ultra book scores, that's cool!)Point being 'Most' folks haven't the needs or just plain 'wants' those of us frequenting Anandtech are looking at for our next computer. That said, a dozen hours, two pounds and those improvements are all fine choices for someone not rendering video or manipulating 200 RAW 50mpxl images 'on the run' --- the perceived and 'real speed' increases via SSD storage, the iGPU and fabless quiet design might just make for an excellent commuter computer for many of us, at just 7-$999! Like the new MacBook, it's got a place in the marketplace for the masses but if it's not the solution you're lookong for the Broadwell 35/45 watt MacBook pro, XPS 15 and 17" workstations, etc ...they'll be here sooner than later and from all things I've seen, other than maybe a 5-8% power increase and savings over Haswell, there's plenty of options on the market today that cover the basesI'll be 44 this year and started with an Apple IIe. What a cool time to be a 'geek'!JReply

If Chromebooks could do RDP, than they would make decent thin clients. Otherwise, I don't find much value in them except for cases where you want your device to only be a browser from a management standpoint.Reply